Long Head Tendonitits, Success Stories?

Hi everyone, Ive been plagued by a nagging injury. I recently got a ultrasound to confirm I have tendonitis in the long head of biceps tendon. My physio has me doing exercises to strengthen my RC as well as strengthen my Long Head which he says it very weak. He figures around 12 weeks or a little longer, has anyone successfully recovered from this type of injury/
thanks